<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title>node-element</title>
	<style type="text/css">
		body{
			background: red;
		}
	</style>
</head>
<body autocapitalize="off" alink="green" style="top:10px;left:10px;">
<p><a href="http://www.w3school.com.cn">W3School.com.cn</a></p>
<p><a href="http://www.w3school.com.cn/html/">HTML Tutorial</a></p>
<button>222222b</button>
<script type="text/javascript">
	window.onload = function(argument) {
		// body...
		var button = document.querySelector('button');
		var html = document.querySelector('html');

		function random(number) {
		  return Math.floor(Math.random() * number);
		}

		button.onclick = function() {
		  var rndCol = 'rgb(' + random(255) + ',' + random(255) + ',' + random(255) + ')';
		  button.style.backgroundColor = rndCol;
		};

		button.onauxclick = function() {
		  var rndCol = 'rgb(' + random(255) + ',' + random(255) + ',' + random(255) + ')';
		  button.style.color = rndCol;
		}
	}
</script>
</body>
</html>